Hooker Blackheart BHS539 Transmission Crossmember Hoop

Gen III Hemi Swap Transmission Crossmember Hoop for 1966-1970 B-Body Mopar - Use with NAG1 or 8HP70 Transmission & Crossmember BHS532


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The Hooker Blackheart transmission crossmember hoop is part of the most comprehensive line of Gen III Hemi swap components available for the Mopar B-Body. The BHS539 Crossmember Hoop allows the installation of the popular, NAG1 5-speed or 8HP70 8-speed automatic transmission when used with the corresponding adaptor plate (sold separately). The BHS539 Transmission Crossmember Hoop replaces the very narrow factory Hoop on the original B-Body upper transmission crossmember allowing adequate clearance for drive shaft coupler and Speed sensor tone rings. The BHS539 transmission Crossmember Hoop is specifically designed to replace the factory hoop and when used in combination with the BHS532 transmission crossmember will provide a bolt in clearance solution with OEM strength and durability with no need for any fabrication or welding.


  • Engineered Transmission Mount System Works together with Hooker Blackheart Engine Mounting Brackets, Transmission Crossmember, Long Tube Headers, and Exhaust Systems for an Easy Trouble Free Gen III Hemi Engine Swap in the 1966-1970 Mopar B-Body
  • Provides the Necessary Clearance Through the Upper Transmission Crossmember for the Drive Shaft Coupler and Speed Sensor Ring when Installing the NAG1 or 8HP70 Transmission
  • 1/2” Steel Upper Hoop Provides the Necessary Structural Integrity When Used in Combination with the BHS532 transmission Crossmember (no Welding Required)
  • No Cutting of the Transmission Tunnel Required
  • Accommodates Popular NAG1 or 8HP70 Transmission (Requires Transmission Specific Adaptor plate)
  • Uses the OEM Mounting Holes â€" For Easy Installation
  • Black Coated for Great Looks and Durability
  • Heavy Duty 3/16” and 1/2” Steel Construction for Strength and Durability
  • Includes Mounting Bolts & Instructions

Product Attributes

BrandHooker Blackheart
Emission Code6
Product TypeTransmission Crossmember Hoops
Part NumberBHS539



Vehicle emissions regulations are not applicable to this item.

Tech Resources

-Installation of the BHS539 Crossmember Hoop requires cutting out the OEM upper transmission Tunnel hoop and hammer massaging the transmission tunnel to provide additional space for the BHS539 to install into the transmission tunnel ( see installation Instructions 199R12041)
-Requires the use of BHS532 Transmission Crossmember to maintain proper structural integrity of the vehicle.


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